Malicious PDF — malware analysis report

Static analysis result for SHA-256 52b474685fa2c4b0…

MALICIOUS

PDF

89.4 KB Created: 2021-06-28 02:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 224dbd8c65b829506ebf3720d8f69409 SHA-1: 603c7dc6cc2c94333335a0c36f37bb934607df57 SHA-256: 52b474685fa2c4b0c060001dd97fa696fe343eb42822969086e30fc26213d8d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The PDF's structure and embedded links are consistent with a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a916703f02---74433705541.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/eqqalutcvbo6er5m7ejggudpc3/35327372582.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7183a30bc0---mutukojararet.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b82979e80d---92805939540.pdf
    • http://arohitourandtravels.com/userfiles/file/popedumukatafoguti.pdf
    • http://doggystylzgrooming.com/admin/photos/file/13544865852.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607509162ab2c---gatiwazawowakizizigejotoz.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0a3486bf1191bae1vde51v1pp4/90418999673.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfa3c91f91---28748880100.pdf
    • http://akvari-um.ru/userfiles/file/vadelodozitutisazudubujat.pdf
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/af1f444d8cbe27416d2afa6d7516e880/93514595625.pdf
    • http://ecohost.ru/pics/images/file/tabofedose.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/waxem.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160716b0a7adb3---59460097386.pdf
    • http://weberstellen.ch/userfiles/file/pajoxireze.pdf
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/sewavadonixeburifulove.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073eee7cf6c6---sogenofetesiso.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca600e92d7---taxax.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/a5dd517994be9a319bfe41da6317b5d6/kizagomozirifemiked.pdf
    • http://tecsun-moscow.ru/docs/file/wiropufelexisifefakelij.pdf
    • http://angelescare.com/userfiles/file/49587774653.pdf
    • https://thai-airpark.com/ckfinder/userfiles/files/daledepobi.pdf
    • https://ihotel2b.com/upfiles/editor/files/88358794469.pdf
    • http://bociany.sk/media/file/gadowikekaxefejusiwupola.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be23c3995b6---rofabemavuzitudezewul.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=classic+priest+leveling+build
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8c6.bin
e1dd259a71b6ea0863c413659e9a1295c97c951cc8766a2c0e1f705efddc11c7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C6 17140 bytes
font_01_sfnt_off0001258b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1258B 16792 bytes
font_02_sfnt_off00013da2.bin
23360173fc481ab29c2c566be45516663d95f465f474a70cd533c03cfdb765de
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA2 10908 bytes